Luka Magnotta's mom is convinced her son didn't act alone when he killed kittens on camera ... she says the mysterious "Manny" was involved, and evidence is being ignored!!!
The convicted murderer's mother, Anna Yourkin, tells TMZ ... she firmly believes the third hand lurking in Luka's infamous cat-killing video belongs to none other than Emanuel "Manny" Lopez ... a position Luka has strongly maintained.
Anna says Canadian cops and Interpol are ignoring one crucial piece of evidence from Netflix's explosive docu-series on Luka, "Don't F**k With Cats" -- the third hand in the frame when Luka allows a python to devour a kitty.
Luka claims Manny forced him to kill the feline, but the Netflix doc insinuates Manny is a fictional person based on a character in "Basic Instinct." When you watch the video, the third hand does NOT move. No one knows who it belongs to, but Luka's mom says it's gotta be Manny's.
Anna also claims Luka emailed her a photo of Manny BEFORE the cat-killing video, and told her not to open it unless something happened to him. Problem is, Anna claims Interpol seized her email and the alleged Manny photo.
Oh, and get this ... Luka's mom says he's still trying to run an online publicity campaign from behind bars, and it's causing a major family rift.